Oxygen is formed from carbon dioxide in (1), while carbon dioxide is formed from oxygen in (2).

(1) photosynthesis, (2) cellular respiration
(1) cellular respiration, (2) photosynthesis
(1) fermentation, (2) anaerobic respiration
(1) aerobic respiration, (2) photosynthesis

What is any method of measuring the age of an object or event in years, such as using atomic half-life?

The most effective way to provide children with safety messages is to

Which statement correctly compares metaphase i and metaphase ii? in metaphase ii twice as many chromosomes line up along the middle of the cell as in metaphase i. in metaphase i twice as many chromosomes line up along the middle of the cell as in metaphase ii. in metaphase ii twice as many chromosomes are pulled to opposite ends of the cell as in metaphase i. in metaphase i twice as many chromosomes are pulled to opposite ends of the cell as in metaphase ii.